diff options
Diffstat (limited to 'usr.bin/more/signal.c')
| -rw-r--r-- | usr.bin/more/signal.c | 221 |
1 files changed, 0 insertions, 221 deletions
diff --git a/usr.bin/more/signal.c b/usr.bin/more/signal.c deleted file mode 100644 index c8be3af..0000000 --- a/usr.bin/more/signal.c +++ /dev/null @@ -1,221 +0,0 @@ -/* - * Copyright (c) 1988 Mark Nudleman - * Copyright (c) 1988, 1993 - * The Regents of the University of California. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#ifndef lint -static char sccsid[] = "@(#)signal.c 8.1 (Berkeley) 6/6/93"; -#endif /* not lint */ - -/* - * Routines dealing with signals. - * - * A signal usually merely causes a bit to be set in the "signals" word. - * At some convenient time, the mainline code checks to see if any - * signals need processing by calling psignal(). - * If we happen to be reading from a file [in iread()] at the time - * the signal is received, we call intread to interrupt the iread. - */ - -#include <less.h> -#include <signal.h> - -/* - * "sigs" contains bits indicating signals which need to be processed. - */ -int sigs; - -#ifdef SIGTSTP -#define S_STOP 02 -#endif -#if defined(SIGWINCH) || defined(SIGWIND) -#define S_WINCH 04 -#endif - -extern int sc_width, sc_height; -extern int screen_trashed; -extern int lnloop; -extern int linenums; -extern volatile int reading; - -#ifdef SIGTSTP -/* - * "Stop" (^Z) signal handler. - */ -static void -stop() -{ - (void)signal(SIGTSTP, stop); - sigs |= S_STOP; - if (reading) - intread(); -} -#endif - -#ifdef SIGWINCH -/* - * "Window" change handler - */ -void -winch() -{ - (void)signal(SIGWINCH, winch); - sigs |= S_WINCH; - if (reading) - intread(); -} -#else -#ifdef SIGWIND -/* - * "Window" change handler - */ -winch() -{ - (void)signal(SIGWIND, winch); - sigs |= S_WINCH; - if (reading) - intread(); -} -#endif -#endif - -static void -purgeandquit() -{ - - purge(); /* purge buffered output */ - quit(); -} - -/* - * Set up the signal handlers. - */ -init_signals(on) - int on; -{ - if (on) - { - /* - * Set signal handlers. - */ - (void)signal(SIGINT, purgeandquit); -#ifdef SIGTSTP - (void)signal(SIGTSTP, stop); -#endif -#ifdef SIGWINCH - (void)signal(SIGWINCH, winch); -#else -#ifdef SIGWIND - (void)signal(SIGWIND, winch); -#endif -#endif - } else - { - /* - * Restore signals to defaults. - */ - (void)signal(SIGINT, SIG_DFL); -#ifdef SIGTSTP - (void)signal(SIGTSTP, SIG_DFL); -#endif -#ifdef SIGWINCH - (void)signal(SIGWINCH, SIG_IGN); -#endif -#ifdef SIGWIND - (void)signal(SIGWIND, SIG_IGN); -#endif - } -} - -/* - * Process any signals we have received. - * A received signal cause a bit to be set in "sigs". - */ -psignals() -{ - register int tsignals; - - if ((tsignals = sigs) == 0) - return; - sigs = 0; - -#ifdef S_WINCH - if (tsignals & S_WINCH) - { - int old_width, old_height; - /* - * Re-execute get_term() to read the new window size. - */ - old_width = sc_width; - old_height = sc_height; - get_term(); - if (sc_width != old_width || sc_height != old_height) - { - (void) setvari("_sc_width", (long) sc_width); - (void) setvari("_sc_height", (long) sc_height - 1); - screen_trashed = 1; - } - } -#endif -#ifdef SIGTSTP - if (tsignals & S_STOP) - { - /* - * Clean up the terminal. - */ -#ifdef SIGTTOU - (void)signal(SIGTTOU, SIG_IGN); -#endif - lower_left(); - clear_eol(); - deinit(); - (void)flush(); - raw_mode(0); -#ifdef SIGTTOU - (void)signal(SIGTTOU, SIG_DFL); -#endif - (void)signal(SIGTSTP, SIG_DFL); - (void)kill(getpid(), SIGTSTP); - /* - * ... Bye bye. ... - * Hopefully we'll be back later and resume here... - * Reset the terminal and arrange to repaint the - * screen when we get back to the main command loop. - */ - if (sigs & S_STOP) sigs &= ~(S_STOP); - (void)signal(SIGTSTP, stop); - raw_mode(1); - init(); - screen_trashed = 1; - } -#endif -} |
